Dr. Oz on Weight Loss

6 Best Fish for Weight Loss

February 19, 2015
6 Best Fish for Weight Loss
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6 Best Fish for Weight Loss
Fish are confusing.
Cecelia Smith February 19, 2015

Was it halibut that you ate last night—or haddock? Was it fluke or flounder? Redfish or whitefish? Bluefin or yellowtail? Snow crab or stone crab? Which one was good for the environment? Which one was good for your waist? And which one was so loaded with mercury it was like chewing on a thermometer?

One thing we do know for certain is that regularly eating seafood as part of a healthy diet can do wonders for your weight loss goals—so long as you choose the right kind. That’s where the waters get murky again. So we had our research team here at Eat This, Not That! dive into the science behind your seafood. Let’s see if we can’t clear things up with this list of the best fish for losing weight.


You might be surprised to learn that steamed white fish like halibut tops fiber-rich oatmeal and vegetables in the satiety department. The Satiety Index of Common Foods, an Australian study published in theEuropean Journal of Clinical Nutrition, ranks it the number two most filling food—bested only by boiled potatoes for its fullness factor. A separate Australian study that compared the satiety of different animal proteins found a nutritionally similar white fish (flake) to be significantly more satiating than beef and chicken; satiety following the white-fish meal also declined at a much slower rate. Study authors attribute the filling factor of white fish like halibut to its impressive protein content and influence on serotonin, one of the key hormones responsible for appetite signals. Just make sure you avoid tilapia.


Scientists have yet to prove oysters well-known reputation as an aphrodisiac, but research has shown oysters’ lesser-known potential as natural weight loss aid. A half dozen order will set you back a mere 43 calories (the equivalent of a single Saltine cracker!), and provide 21 percent of your recommended daily allowance for iron, deficiencies of which have been linked to a significant increase in fat gene expression. What’s more, oysters are one of the best food sources of zinc, a mineral that works in tandem with the “I’m hungry!” hormone, leptin, to regulate appetite. Research shows overweight people tend to have higher levels of leptin and lower levels of zinc, in comparison to lean folks. One study in the journalLife Sciencesfound supplementing with zinc could increase leptin production in obese men by 142 percent. Get a shuck-load of zinc, naturally, with oysters—just six fulfills your recommended daily need by 200 percent! So make a happy-hour habit of hitting up the raw bar for a dozen on the half-shell; the order will get you into your skinny jeans, even if it doesn’t get you into anyone else’s.

Wild Salmon

Don’t let salmon’s relatively high calorie and fat content fool you; studies suggest the oily fish may be one of the best for weight loss. (In fact, it makes our list of the fatty foods that will help you lose weight.) In one study, participants were divided into groups and assigned one of three equi-caloric weight loss diets that included no seafood (the control group), lean white fish, or salmon. Everyone lost weight, but the salmon eaters had the lowest fasting insulin levels and a marked reduction in inflammation. Another study in theInternational Journal of Obesityfound that eating three 5-ounce servings of salmon per week for four weeks as part of a low-calorie diet resulted in approximately 2.2 pounds more weight lost than following a equip-calorie diet that didn't include fish. Wild salmon is leaner than farmed, which is plumped up on fishmeal; and it’s also proven to be significantly lower in cancer-linked PCBs. So go wild—literally!


The seafood jury rules scallops shall remain innocent until proven guilty! While they’re often guilty as by association with creamy and decadent restaurant sauces (not great for weight loss), the high-protein, low-calorie mollusks themselves are great for your waistline, and even your cholesterol. One study published in theJournal of Food Sciencefound bioactive capsules made from scallop byproducts to show significant anti-obesity effects. Animals fed the capsules—a mixture of scallop and seaweed—over the course of 4 weeks showed greater reductions in body weight and body fat, compared to a control, which authors attribute to scallop’s high protein content (In fact, a scallop is 80 percent protein, and the part you eat is the mollusk’s adductor muscle!). A separate study that looked at the effects of different proteins on adipose tissue and glucose tolerance found scallops to reign supreme. Mice fed scallop protein showed lower blood cholesterol and diet-induced obesity levels compared to mice fed equi-caloric portions of casein or chicken protein.

Light Canned Tuna

Tuna or to-not? That is the question. As a primo source of docosahexaenoic acid (DHA), canned light tuna is one of the best and most affordable fish for weight loss, especially from your belly! One study in theJournal of Lipid Researchshowed that omega 3 fatty acid supplementation had the profound ability to turn off abdominal fat genes. And while you’ll find two types of fatty acids in cold water fish and fish oils—DHA and eicosapentaenoic acid (EPA)—researchers say DHA can be 40 to 70 percent more effective than EPA at down regulating fat genes in the abdomen, preventing belly fat cells from expanding in size. But what about the mercury? Mercury levels in tuna vary by species; generally speaking, the larger and leaner the fish, the higher the mercury level. Bluefin and albacore rank among the most toxic, according to a study inBiology Letters. But canned chunk light tuna, harvested from the smallest fish, is considered a “low mercury fish” and can–and should!–be enjoyed two to three times a week (or up to 12 ounces), according to the FDA’s most recent guidelines.

Pacific Cod

Fish and chips won’t help you lose weight, at least not out of the fryer. But research suggests a regular serving of Pacific cod, the fish that’s typical of fish sticks, may keep you stick thin. One study in the journalNutrition, Metabolism & Cardiovascular Diseasesfound that eating five servings of cod per week as part of a low-calorie diet for eight weeks resulted in an extra 3.8 pounds of weight loss compared to a diet with the same amount of calories but no fish. And a second study in theEuropean Journal of Clinical Nutritionfound that people ate 11 percent less at dinner after having cod for lunch versus those who ate a beef lunch. Researchers attribute the satiating and slimming properties to cod’s high protein content and amino acid profile, which can help regulate the metabolism.

Video: Top 3 Best Fish vs. Worst Fish to Eat: Thomas DeLauer

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